[Zope-dev] Delete or move - who can tell?

Hi! Is there really no way for an object to know wether a call to manage_beforeDelete is the result of a delete or a move operation? I've tried to override _notifyOfCopyTo and setting an internal variable based on the op parameter, but alas it's not called when moving the parent... I have another class of objects which must not be cloned (sitewide unique) and I have overridden _CanCopy to avoid this, but again it's simply ignored when the parent is cloned... Any suggestions? Tom